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/usr/share/live/build/hooks/001-update-apt-file-cache.chroot is in live-build 3.0~a57-1ubuntu25.

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#!/bin/sh

set -e

# Update the Apt File cache.
#
# This allows to use using apt-file out-of-the-box.

. /root/config/binary

if [ -x /usr/bin/apt-file ] && [ "${LB_APT_INDICES}" = "true" ]
then
	apt-file update
fi